The correct answer is D) filing legislative bills at the beginning of every legislative session.
Governors can be quite powerful in spite of the weaknesses of the office by doing all of the following except "filing legislative bills at the beginning of every legislative session."
In the United States, the governor of most of the states is a powerful man/woman with a degree of influence in many governmental, economic and social issues, he/she can mobilize interest groups and editorial boards of newspapers, call special sessions of the legislature, and pardoning criminals and permitting fugitives to be extradited to other states. But one of the things the governor can't do is filing legislative bills at the beginning of every legislative session. Other faculty that most governors have is the power to appoint judges on the court.